Publication Citation: Large Area Pt/n-GaN Schottky Photodiodes With Extremely Low Leakage Current

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Author(s):

A Shahid; Robert E. Vest; D Franz; F Yan; Y Zhao; D B. Mott;

Title:

Large Area Pt/n-GaN Schottky Photodiodes With Extremely Low Leakage Current

Published:

August 19, 2004

Abstract:

Pt/n-type GaN Schottky photodiodes with very large active areas (0.25 cm2 and 1 cmu2) which exhibit extremely low leakage currents at low reverse bias are reported. The Schottky photodiodes were fabricated from n-/n+ epitaxial layers grown by low pressure metalorganic vapour phase epitaxy on single crystal c-plane sapphire. The current-voltage (I-V) characteristics of several 0.25 cmu2n devices are presented together with the capacitance-voltage (C-V) characteristics of one of these devices. A leakage current as low as 14 pA at 0.5 V reverse bias is reported, for a 0.25 cm2 diode. A peak responsivity of 71 mA/W at 320nm is reported for one of the fabricated devices, corresponding to a spectral detectivity, 4.62x10u14 cm Hzu1/2 Wu-1. The spatial responsivity uniformity variation was established, using Hd2u Lyman -alpha radiation, to be -+3% across the surface of a typical 0.25 cmu2d diode.

Citation:

Large Area Pt/n-GaN Schottky Photodiodes With Extremely Low Leakage Current